Reg Edwards wrote:
You will get all sorts of technical reasons for lower loss. But
essentially -
The wires in high impedance balanced pair lines are thicker than the
inner conductor of coaxial lines.
Thicker wires mean lower resistance.
Lower resistance means lower loss.
That is true. But the number one reason that matched line loss
for 450 ohm ladder-line is lower than matched line loss for RG-213
at HF is the effect of (characteristic impedance = load) which is
the same effect as Ohm's law.
Given RG-213 vs 450 ohm ladder-line the losses are *roughly*
equal when:
SWR(coax)/50 = SWR(ladder-line)/450
or, in general, when:
SWR1/Z01 = SWR2/Z02
--
73, Cecil
http://www.qsl.net/w5dxp
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